<html>
<head>
<title>Testcase bug - Crash [@ nsSubDocumentFrame::Reflow] with testcase, using first-letter, first-line, inline-block  and iframes</title>
</head>
<body>
<div style="width:1440px;" id="a">
<div>
<fieldset>

<legend style="display: inline-block;"></legend>
<span></span>
<iframe></iframe>
<iframe></iframe>
<legend style="display: list-item;">
<iframe></iframe>
</legend>
</fieldset>
</div>
</div>
<script>
function addfirstline(){
var x=document.createElementNS('http://www.w3.org/1999/xhtml','style');
x.innerHTML='\
#a *::first-letter { }\
#a *::first-line {}\
#a *::after { content:"anonymous text"; text-transform: uppercase;height: 90%;}\
#a *::before { content:"before text"; font-size: 10px;}\
';
document.documentElement.appendChild(x);
}
setTimeout(addfirstline,200);

var j=0;
function replacestyles(i){
var x=document.getElementById('a').getElementsByTagName('*');
if (j>=2) return;
if (x[i] && x[i+1])
  {
var temp = x[i+1].getAttribute('style');
x[i+1].setAttribute('style', x[i].getAttribute('style'));
x[i].setAttribute('style', temp);
}
else { i = 0;j++;}
  i++;
setTimeout(replacestyles,50,i);
}
setTimeout(replacestyles,500,0);
</script>
</body>
</html>